The RB Leipzig striker is set to join Chelsea this summer.
"He's a really good player and £50m in the world of football nowadays is as good a price as you're going to get for a player who has so much potential," he told Sky Sports.
"What he has is a versatility, but he doesn't just play through the middle - he can play in a wide area and cuts in.
"He was playing as an out and out centre forward at Stuttgart and it was only under Julian Nagelsmann at Leipzig where he was put out wide in a game against Bayern Munich to try to counter Bayern's wide players. He's very quick and showed his ability and versatility from there.
"Chelsea have some really good young players but I don't see a problem with him coming in. I thought he'd end up at Liverpool given the German connection, but it will be a case of who Chelsea look to play alongside him.
"There's been more responsibility put on him this season and he's responded. He has sometimes even played in a No 10 role which again has shown his versatility."